<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无标题文档</title>
<script>
window.onload = function() {
var oDiv = document.getElementById('div1');
var oBtn = document.getElementById('btn');
var oP = document.getElementById('p1');
oBtn.onclick = function() {
/*
父级.replaceChild(新节点，被替换节点) 替换子节点
*/
//document.body.replaceChild( oDiv, oP );
/*
appendChild,insertBefore,replaceChild都可以操作动态创建出来的节点，也可以操作已有节点
*/
//oP.appendChild( oDiv );
}
}
</script>
</head>
<body>
<div id="div1">div1</div>
<input type="button" value="按钮" id="btn" />
<hr />
<p id="p1">ppppp</p>
</body>
</html>